Oil Pressure; Measuring Exhaust Pressure - Westerbeke 6.5 MCG Service Manual

· OIL PRESSURE
OIL PRESSURE SENDER
The engine oil pressure is continually monitored by the ECU
in the generator control panel when the engine is running,
Should the oil pressure fall below a safe operating level, the
generator will shut-down and the control panels low oil
pressure fault LED will illuminate. Should this occur, do not
· attempt to re-start the generator. Check the oil level and the
condition (consistancy) of the oil. If there is a loss of oil,
inspect the engine for leaks. Inspect the wire connections at
the oil gallery (Pressure Senser).
OIL PRESSURE SWITCH
An oil pressure switch is located on the right side of the oil
filter mounting bracket. This is a normally open contact
switch. It functions with the time relay circuit to ensure DC
voltage to the circuit is terminated when the unit shuts down.
TESTING THE OIL PRESSURE SENDER
To test the engines oil pressure, remove the oil pressure
switch in the oil gallery and install a mechanical oil pressure
test gauge. Start the engine, and with the engine running at
its
normal RPM, record the pressure.
OIL PRESSURE AT 1800/1500 35-45 PSI OR MORE
OIL PRESSURE
. TEST GAUGE ·
LOW OIL PRESSURE
OIL GALLERY
REMOVE THE OIL
PRESSURE SWITCH
TO INSTALL THE
TEST GAUGE
OIL PRESSURE AT 1800/1500
35-45 PSI OR MORE
A legitimate loss of oil pressure can be the result of a faulty
oil pressure relief valve or possibly worn bearings in the
engine.
MEASURING EXHAUST BACK PRESSURE
Exhaust systems normally produce resistance to the flow of
exhaust gases, causing back-pressure. Back-pressure must be
kept within a certain limit. Check the back-pressure before
the generator is put back into service.
To test exhaust pressure, connect either a water column or
PSI tube to the test part on the exhaust elbow as shown.
Check the exhaust back-pressure before the generator is put
into service. Measure the back-pressure after the engine has
reached its normal operating temperature, and at the point
where it is about to reach its rated load at either 1500 rpm
(for 50Hz applications) or 1800 rpm (for 60Hz applications).
Back-pressure should not exceed 1.5 psi (0.11 kg/em\
MEASURING EXHAUST BACK
PRESSURE
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PSI
GAUGE